Only use loadUri when switching to desktop mode if the URL changes. (#2949)

Author: bluemarvin

app/src/common/shared/org/mozilla/vrbrowser/browser/engine/Session.java

@@ -821,8 +821,11 @@ public void setUaMode(int mode) {
             mState.mSettings.setViewportMode(GeckoSessionSettings.VIEWPORT_MODE_MOBILE);
         }
         mState.mSession.getSettings().setViewportMode(mState.mSettings.getViewportMode());
-        // FIXME The GeckoSession.LOAD_FLAGS_REPLACE_HISTORY flag fails due to https://bugzilla.mozilla.org/show_bug.cgi?id=1618664
-        mState.mSession.loadUri(overrideUri != null ? overrideUri : mState.mUri, GeckoSession.LOAD_FLAGS_BYPASS_CACHE); //  | GeckoSession.LOAD_FLAGS_REPLACE_HISTORY);
+        if (overrideUri != null) {
+            mState.mSession.loadUri(overrideUri, GeckoSession.LOAD_FLAGS_BYPASS_CACHE | GeckoSession.LOAD_FLAGS_REPLACE_HISTORY);
+        } else {
+            mState.mSession.reload(GeckoSession.LOAD_FLAGS_BYPASS_CACHE);
+        }
     }